77 lines
2.8 KiB
Solidity
77 lines
2.8 KiB
Solidity
// SPDX-License-Identifier: MIT
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pragma solidity 0.7.6;
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pragma abicoder v2;
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import { Address } from "@openzeppelin/contracts/utils/Address.sol";
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import { Initializable } from "@openzeppelin/contracts/proxy/Initializable.sol";
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import "@openzeppelin/contracts/proxy/Clones.sol";
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import "./instances/ERC20TornadoCloneable.sol";
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import "./instances/ETHTornadoCloneable.sol";
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contract MinimalInstanceFactory {
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using Clones for address;
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using Address for address;
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address public immutable ERC20Impl;
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address public immutable nativeCurImpl;
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address public immutable verifier;
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address public immutable hasher;
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uint32 public immutable merkleTreeHeight;
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event NewTreeHeightSet(uint32 indexed newTreeHeight);
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event NewImplementationSet(address indexed ERC20Impl, address indexed nativeCurImpl, address verifier, address hasher);
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event NewInstanceCloneCreated(address indexed clone);
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/**
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* @notice This instance factory is NOT permissioned. It is designed to always be able to print
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* new Tornado Instances if necessary.
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* @dev Creates new Tornado instance.
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*/
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constructor(address _verifier, address _hasher, uint32 _merkleTreeHeight) public {
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verifier = _verifier;
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hasher = _hasher;
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merkleTreeHeight = _merkleTreeHeight;
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ERC20TornadoCloneable ERC20ImplContract = new ERC20TornadoCloneable(_verifier, _hasher);
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ERC20Impl = address(ERC20ImplContract);
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ETHTornadoCloneable nativeCurImplContract = new ETHTornadoCloneable(_verifier, _hasher);
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nativeCurImpl = address(nativeCurImplContract);
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}
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/**
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* @notice Creates new Tornado instance.
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* @param _denomination denomination of new Tornado instance
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* @param _token address of ERC20 token for a new instance, if zero address, then it will be ETH
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*/
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function createInstanceClone(uint256 _denomination, address _token) public virtual returns (address clone) {
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bytes32 salt = keccak256(abi.encodePacked(_denomination, _token));
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if (_token == address(0)) {
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clone = nativeCurImpl.predictDeterministicAddress(salt);
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if (!clone.isContract()) {
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nativeCurImpl.cloneDeterministic(salt);
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emit NewInstanceCloneCreated(clone);
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ETHTornadoCloneable(clone).init(_denomination, merkleTreeHeight);
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}
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} else {
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clone = ERC20Impl.predictDeterministicAddress(salt);
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if (!clone.isContract()) {
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ERC20Impl.cloneDeterministic(salt);
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emit NewInstanceCloneCreated(clone);
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ERC20TornadoCloneable(clone).init(_denomination, merkleTreeHeight, _token);
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}
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}
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return clone;
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}
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function getInstanceAddress(uint256 _denomination, address _token) public view returns (address) {
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bytes32 salt = keccak256(abi.encodePacked(_denomination, _token));
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if (_token == address(0)) {
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return nativeCurImpl.predictDeterministicAddress(salt);
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} else {
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return ERC20Impl.predictDeterministicAddress(salt);
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}
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}
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}
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